qed*: Add iWARP 100g support

Add iWARP engine affinity setting for supporting iWARP over 100g.
iWARP cannot be distinguished by the LLH from L2, hence the
engine division will affect L2 as well. For this reason we add
a parameter to devlink to determine the engine division.

Signed-off-by: Ariel Elior <ariel.elior@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/infiniband/hw/qedr/main.c

@@ -871,7 +871,16 @@ static struct qedr_dev *qedr_add(struct qed_dev *cdev, struct pci_dev *pdev,
 	dev->user_dpm_enabled = dev_info.user_dpm_enabled;
 	dev->rdma_type = dev_info.rdma_type;
 	dev->num_hwfns = dev_info.common.num_hwfns;
+
+	if (IS_IWARP(dev) && QEDR_IS_CMT(dev)) {
+		rc = dev->ops->iwarp_set_engine_affin(cdev, false);
+		if (rc) {
+			DP_ERR(dev, "iWARP is disabled over a 100g device Enabling it may impact L2 performance. To enable it run devlink dev param set <dev> name iwarp_cmt value true cmode runtime\n");
+			goto init_err;
+		}
+	}
 	dev->affin_hwfn_idx = dev->ops->common->get_affin_hwfn_idx(cdev);
+
 	dev->rdma_ctx = dev->ops->rdma_get_rdma_ctx(cdev);
 
 	dev->num_cnq = dev->ops->rdma_get_min_cnq_msix(cdev);
@@ -932,6 +941,10 @@ static void qedr_remove(struct qedr_dev *dev)
 	qedr_stop_hw(dev);
 	qedr_sync_free_irqs(dev);
 	qedr_free_resources(dev);
+
+	if (IS_IWARP(dev) && QEDR_IS_CMT(dev))
+		dev->ops->iwarp_set_engine_affin(dev->cdev, true);
+
 	ib_dealloc_device(&dev->ibdev);
 }
 

drivers/net/ethernet/qlogic/qed/qed_rdma.c

@@ -1916,6 +1916,36 @@ static int qed_roce_ll2_set_mac_filter(struct qed_dev *cdev,
 	return rc;
 }
 
+static int qed_iwarp_set_engine_affin(struct qed_dev *cdev, bool b_reset)
+{
+	enum qed_eng eng;
+	u8 ppfid = 0;
+	int rc;
+
+	/* Make sure iwarp cmt mode is enabled before setting affinity */
+	if (!cdev->iwarp_cmt)
+		return -EINVAL;
+
+	if (b_reset)
+		eng = QED_BOTH_ENG;
+	else
+		eng = cdev->l2_affin_hint ? QED_ENG1 : QED_ENG0;
+
+	rc = qed_llh_set_ppfid_affinity(cdev, ppfid, eng);
+	if (rc) {
+		DP_NOTICE(cdev,
+			  "Failed to set the engine affinity of ppfid %d\n",
+			  ppfid);
+		return rc;
+	}
+
+	DP_VERBOSE(cdev, (QED_MSG_RDMA | QED_MSG_SP),
+		   "LLH: Set the engine affinity of non-RoCE packets as %d\n",
+		   eng);
+
+	return 0;
+}
+
 static const struct qed_rdma_ops qed_rdma_ops_pass = {
 	.common = &qed_common_ops_pass,
 	.fill_dev_info = &qed_fill_rdma_dev_info,
@@ -1955,6 +1985,7 @@ static const struct qed_rdma_ops qed_rdma_ops_pass = {
 	.ll2_set_fragment_of_tx_packet = &qed_ll2_set_fragment_of_tx_packet,
 	.ll2_set_mac_filter = &qed_roce_ll2_set_mac_filter,
 	.ll2_get_stats = &qed_ll2_get_stats,
+	.iwarp_set_engine_affin = &qed_iwarp_set_engine_affin,
 	.iwarp_connect = &qed_iwarp_connect,
 	.iwarp_create_listen = &qed_iwarp_create_listen,
 	.iwarp_destroy_listen = &qed_iwarp_destroy_listen,

include/linux/qed/qed_rdma_if.h

@@ -670,6 +670,8 @@ struct qed_rdma_ops {
 	int (*ll2_set_mac_filter)(struct qed_dev *cdev,
 				  u8 *old_mac_address, u8 *new_mac_address);
 
+	int (*iwarp_set_engine_affin)(struct qed_dev *cdev, bool b_reset);
+
 	int (*iwarp_connect)(void *rdma_cxt,
 			     struct qed_iwarp_connect_in *iparams,
 			     struct qed_iwarp_connect_out *oparams);